Mr. Zietlow has worked in geotechnical engineering for ten years and specializes in design of soil retention systems such as soil nail, tieback, and micropile walls and landslide stabilizations. He primarily provides design services for specialty contractors on design-build projects. He has also provided geotechnical designs for public and private owners, primarily on transportation and utility works. He has experience on a wide variety of projects across the Western and Midwestern United States. His responsibilities include retaining wall and shoring design, project management, geotechnical investigations and construction observation.

In addition to design engineering, Mr. Zietlow has planned and performed geotechnical investigations for retaining walls, landslides, tunnels, rock slopes, shoring, slurry walls and deep foundations. He has performed site investigations in hard and soft rock and colluvial, alluvial and glacial soils. Additionally, Mr. Zietlow has performed geotechnical and structural construction observation for retaining wall, landslide mitigation, tunnel, rock slope, slurry wall and deep foundation projects. Mr. Zietlow has performed and analyzed numerous soil nail, rock bolt and tieback load testing and pre-stressing tests. Mr. Zietlow has also installed and monitored geotechnical instrumentation for tunnels, land slides, shoring, and retaining and slurry walls.

Relevant Project Experience

• Columbia Slough Interceptor Tunnel, Portland, Oregon, monitored settlement points and compaction grout mixing and pumping for a 20-ft diameter soft ground TBM tunnel, 1998.
• Windy Point Rock Slope, US 285 Widening, Conifer, Colorado, mapped excavated rock surface structure for rock slope design, performed proof and performance tests on rock bolts, 2000 and 2001.
• Mendocino Pass Landslide, Glenn County, California, logged rock core, installed and monitored inclinometers, designed tieback mitigation, 2002.
• I-235 Widening, Des Moines, Iowa, designed 50,000 SF of soldier pile tie back retaining walls, 2003.
• River Crossings, Sacramento, California, installed tunnel settlement monitoring instrumentation including inclinometers, piezometers and surface settlement points, 2004.
• Tarnes Parking Lot, Vail, Colorado, designed soil nail wall supporting clay slope up to 37-ft tall, 2004.
• Fitzgerald's Parking Lot, Black Hawk, Colorado, designed permanent soil nail wall up to 35-ft tall, 2004.
• US 40 Widening, Berthoud Pass, Colorado, designed soil nail and tieback retaining walls, 2004 and 2005.
• 120th Avenue Bridge Underpass, Thorton, Colorado, designed soil nail walls under bridge abutment, 2005.
• Main St. Extension, Black Hawk, Colorado, performed and evaluated soil nail proof testing, performed and evaluated strand tieback pre-stressing, 2005.
• Walgreen's, Golden, Colorado, designed 10,000 SF of soil nail and MSE walls up to 25-ft high, 2006.
• Grand Saline Tunnel Incline, Grand Saline, Texas, logged soil, rock and salt core, 2006.
• Ken Mitchell Lakes Slurry Wall, Brighton, Colorado, logged soil and rock borings, performed packer tests, installed and monitored piezometers and performed liner acceptance test, 2004-2007.

Education
MS Geotechnical Engineering - April 1997 University of Minnesota
BS Geotechnical Engineering - June 1995 University of Minnesota
BS Economics - August 1990 University of Minnesota

Professional Registrations
Professional Engineer in Colorado, Iowa, North Carolina, New Mexico and Arizona.